Plastics - Phenol-formaldehyde mouldings - Determination of free phenols - Iodometric method (ISO 119:1977)

A semiquantitative method for the determination of the amount of free phenols in phenolic mouldings. Hot water extraction of free phenols from a powdered test portion, iodination of the water extract and backtitration of the excess of iodine with standard volumetric thiosulfate solution.

Kunststoffe - Phenoplast-Formteile - Bestimmung der freien Phenole - Iodometrisches Verfahren (ISO 119:1977)

Diese Internationale Norm beschreibt ein jodometrisches Verfahren zur halbquantitativen Bestimmung des Gehaltes an freien Phenolen in Phenoplast-Formteilen. ANMERKUNG: Diese Internationale Norm liefert keine Absolutwerte der vorhandenen freien Phenole. Die Menge an freien Phenolen in einem Formteil hängt in hohem Maße vom Grad der Aushärtung ab. Ihre Bestimmung ist ebenfalls von Interesse, wenn mit der Möglichkeit der Verunreinigung von Lebensmitteln oder anderen Gegenständen gerechnet werden muß.

Plastiques - Pieces moulées a base de phénoplastes - Dosage des phénols libres - Méthode iodométrique (ISO 119:1977)

Polimerni materiali - Fenol-formaldehidni oblikovanci - Določevanje prostega fenola - Jodometrična metoda (ISO 119.1977)

General Information

Status
Published
Publication Date
30-Apr-2000
Current Stage
6060 - National Implementation/Publication (Adopted Project)
Start Date
01-May-2000
Due Date
01-May-2000
Completion Date
01-May-2000

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SLOVENSKI STANDARD
SIST EN ISO 119:2000
01-maj-2000
3ROLPHUQLPDWHULDOL)HQROIRUPDOGHKLGQLREOLNRYDQFL'RORþHYDQMHSURVWHJD
IHQROD-RGRPHWULþQDPHWRGD ,62

Plastics - Phenol-formaldehyde mouldings - Determination of free phenols - Iodometric

method (ISO 119:1977)

Kunststoffe - Phenoplast-Formteile - Bestimmung der freien Phenole - Iodometrisches

Verfahren (ISO 119:1977)
Plastiques - Pieces moulées a base de phénoplastes - Dosage des phénols libres -
Méthode iodométrique (ISO 119:1977)
Ta slovenski standard je istoveten z: EN ISO 119:1998
ICS:
83.080.10 Duromeri Thermosetting materials
SIST EN ISO 119:2000 en

2003-01.Slovenski inštitut za standardizacijo. Razmnoževanje celote ali delov tega standarda ni dovoljeno.

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SIST EN ISO 119:2000
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SIST EN ISO 119:2000
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SIST EN ISO 119:2000
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SIST EN ISO 119:2000
INTERNATIONAL STANDARD -
119

INTERNATIONAL ORGANIZATION FOR STANDARDIZATION l EXAYHAPO,QHAII OPTAHW3AUIMX IlO CTAHLI[APTW3AUWU.ORGANISATION INTERNATIONALE DE NORMALISATION

Plastics - Phenol-formaldehyde mouldings - Determination
of free phenols -
lodometric method

Plastiques - Pikes moukes a’ base de phknoplastes - Dosage des phknols libres - Me’thode iodome’trique

First edition - 1977-10-01
UDC 678.632 : 547.56 : 543.8 Ref. No. IS0 119-1977 (E)

Descriptors : plastics, phenol formaldehyde, mouldings, chemical analysis, determination of content, phenols, volumetric analysis.

Price based on 2 pages
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SIST EN ISO 119:2000
FOREWORD

IS0 (the International Organization for Standardization) is a worldwide federation

of national standards institutes (IS0 member bodies). The work of developing
International Standards is carried out through IS0 technical committees. Every
member body interested in a subject for which a technical committee has been set

up has the right to be represented on that committee. International organizations,

governmental and non-governmental, in liaison with ISO, also take part in the work.

Draft International Standards adopted by the technical committees are circulated
to the member bodies for approval before their acceptance as International
Standards by the IS0 Council.
International Standard IS0 119 was developed by Technical Committee ISO/TC 61,
Plastics, and was circulated to the member bodies in November 1975.
It has been approved by the member bodies of the following countries :
Australia India Romania
Belgium
I ran South Africa, Rep. of
Brazil
Israel Spain
Chile
Italy Sweden
Czechoslovakia
Japan Switzerland
Egypt, Arab Rep. of Mexico Turkey
Finland
Netherlands United Kingdom
France
New Zealand U.S.A.
Germany
Peru U.S.S.R.
Hungary
Poland
No member body expressed disapproval of the document.
This International Standard cancels and replaces IS0 Recommendation R 119-1959,
of which it constitutes a technical revision.
0 International Organization for Standardization, 1977 l
Printed in Switzerland
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SIST EN ISO 119:2000
IS0 119-1977 (E)
INTERNATIONAL STANDARD
Plastics - Phenol-formaldehyde mouldings - Determination
lodometric method
of free phenols -
1 SCOPE AND FIELD OF APPLICATION 4.2 Sulphuric acid, 2 N solution.
This International Standard specifies an iodometric method
4.3 Iodine, about 0,05 N solution.
for the semi-quantitative determination of the amount of
free phenols in phenol-formaldehyde mouldings.
Dissolve 6,35 g of iodine in approximately 40 ml of a
500 g/l solution of potassium iodide and dilute to I 000 ml
NOTE - This International Standard does not provide an absolute
with water.
measure of the free phenols present.
The amount of free phenols in a moulded article is
4.4 Sodium thiosulphate, 0,05 N standard volumetric
influenced to a major extent by the degree of cure. Its
solution.
evaluation is also of interest where the possibility of conta-
mination of foodstuffs or other materials in contact with
4.5 Starch, approximately 2,5 g/l solution.
the article has to be considered.
2 REFERENCES
5 APPARATUS
ISO/R 385, Burettes.
Ordinary laboratory apparatus and
Woven metal wire cloth and
IS0 565, Test sieves -
5.1 Means for reducing the mouldings to a powder.
Nominal sizes of apertures.
perforated plate -
IS0 648, Laboratory glassware - One-mark pipettes.1 )
5.2 Sieve, with nominal apertures of 250pm, complying
with the requirements of IS0 565.
3 PRINCIPLE
5.3 Balance, accurate to 0,OI g.
Hot aqueous extraction of free phenols from a powdered
Iodination of the aqueous extract b
...

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